<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function getArrMaxMin(arr=[]) {
            let min=arr[0]
            let max=arr[0]
            for (let i = 1; i < arr.length; i++) {
                if(arr[i]>max) {
                    max=arr[i]
                }     
                if (arr[i]<min) {
                    min = arr[i]
                }          
            }
            return [max,min]
        }
        let newarr = getArrMaxMin([22, 55, 77, 44, 99, 123])
        console.log(`最大数值为${newarr[0]}`)
        console.log(`最小数值为${newarr[1]}`)

    </script>
</body>
</html>